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gcse.c (compute_ld_motion_mems): For MEM destinations...

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* gcse.c (compute_ld_motion_mems): For MEM destinations, only
	consider those to be movable where the source matches
	want_to_gcse_p.
	(update_ld_motion_stores): In comment, refer to
	compute_ld_motion_mems for validity of replacement.

From-SVN: r65766
This commit is contained in:
Hans-Peter Nilsson 2003-04-18 01:29:19 +00:00 committed by Hans-Peter Nilsson
parent dc93be8dce
commit 4d3eb89ac4
2 changed files with 23 additions and 10 deletions
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8
gcc/ChangeLog
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@ -1,3 +1,11 @@
2003-04-18 Hans-Peter Nilsson <hp@bitrange.com>
* gcse.c (compute_ld_motion_mems): For MEM destinations, only
consider those to be movable where the source matches
want_to_gcse_p.
(update_ld_motion_stores): In comment, refer to
compute_ld_motion_mems for validity of replacement.
Fri Apr 18 01:28:51 CEST 2003 Jan Hubicka <jh@suse.cz>
* gcov-dump.c (tag_summary): Remove max_sum

25
gcc/gcse.c
View File

@ -6771,11 +6771,13 @@ invalidate_any_buried_refs (x)
}
}
/* Find all the 'simple' MEMs which are used in LOADs and STORES. Simple
being defined as MEM loads and stores to symbols, with no
side effects and no registers in the expression. If there are any
uses/defs which don't match this criteria, it is invalidated and
trimmed out later. */
/* Find all the 'simple' MEMs which are used in LOADs and STORES. Simple
being defined as MEM loads and stores to symbols, with no side effects
and no registers in the expression. For a MEM destination, we also
check that the insn is still valid if we replace the destination with a
REG, as is done in update_ld_motion_stores. If there are any uses/defs
which don't match this criteria, they are invalidated and trimmed out
later. */
static void
compute_ld_motion_mems ()
@ -6823,7 +6825,10 @@ compute_ld_motion_mems ()
ptr = ldst_entry (dest);
if (GET_CODE (src) != MEM
&& GET_CODE (src) != ASM_OPERANDS)
&& GET_CODE (src) != ASM_OPERANDS
/* Check for REG manually since want_to_gcse_p
returns 0 for all REGs. */
&& (REG_P (src) || want_to_gcse_p (src)))
ptr->stores = alloc_INSN_LIST (insn, ptr->stores);
else
ptr->invalid = 1;
@ -6918,10 +6923,10 @@ update_ld_motion_stores (expr)
matter to set the reaching reg everywhere... some might be
dead and should be eliminated later. */
/* We replace SET mem = expr with
SET reg = expr
SET mem = reg , where reg is the
reaching reg used in the load. */
/* We replace (set mem expr) with (set reg expr) (set mem reg)
where reg is the reaching reg used in the load. We checked in
compute_ld_motion_mems that we can replace (set mem expr) with
(set reg expr) in that insn. */
rtx list = mem_ptr->stores;
for ( ; list != NULL_RTX; list = XEXP (list, 1))